/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.mapreduce;

/**
 * <code>Resources</code> provides some resource locator methods.
 */
public class Resources {
  /**
   * Returns the directory path of MAPREDUCE_HOME environment variable.
   *
   * @return the directory path of MAPREDUCE_HOME environment variable
   * @throws SssException
   */
  public static String getHomeDirectory() throws SssException {
    String home = System.getenv("MAPREDUCE_HOME");
    if (home == null) {
      throw new SssException("$MAPREDUCE_HOME does not set.");
    }
    return home;
  }
  /**
   * Returns the directory path for SSS's configuration files.
   *
   * @return the directory path for SSS's configuration files
   * @throws SssException
   */
  public static String getConfigDirectory() throws SssException {
    return getHomeDirectory() + "/conf";
  }
}
